Last updated: October 15, 2026
Thing to Do
Hike the San Antonio Mountain Trail
NPS/Fred Simmank
This strenuous, 11-mile (17.7 km) out-and-back trail heads south from Valle San Antonio, up a narrow drainage, and then steadily climbs as it passes through several beautiful glades before terminating just below the summit of San Antonio Mountain. Good opportunities for wildflowers, especially in spring and fall.
Elevation: 8,394 - 9,922 feet
Elevation: 8,394 - 9,922 feet
Details
Duration
5-6 Hours
Activity
Backcountry Hiking
Pets Allowed
No
Activity Fee
Yes
As of January 1, 2025, a park entrance fee is required to enter Valles Caldera National Preserve.
Location
San Antonio Mountain Trail
The trailhead is a locked cable gate marked VC08 on the south side of the road, about 4.2 miles west of the T-junction. Park in the small dirt pull-out adjacent to the trailhead along the road. Backcountry vehicle pass required.
Reservations
Yes
Vehicular access to Valles Caldera's backcountry route is limited to 40 public vehicles per day. Passes can be reserved on Recreation.gov up to 3 months in advance.
Season
Spring, Summer, Fall
The backcountry is closed to vehicular traffic from November 15 - May 14.
Time of Day
Day
Accessibility Information
This unpaved, natural surface trail has steep grades. Service animals permitted.